Zhao Yan returned to the villa with a mirror. It was already dinner time. Cao Ying and the others were already sitting in the restaurant to prepare for dinner. At this time, they saw Zhao Yan walking in with a box in her arms and smiling. Then he put the box on the dining table and announced loudly: "Stop, the mirror you have been looking forward to has arrived. Who wants it now?"

As soon as Zhao Yan finished speaking, Princess Shoukang, who had always been faster than her brain, rushed up first, opened the box, picked three mirrors of the same style, ran back to Princess Bao'an and announced: "This is my eldest sister and the second sister, you can choose whatever you want!"

Seeing Princess Shoukang picking the mirror first, Cao Ying and the others finally reacted. They rushed over with their skirts one by one, squeezed around the box and began to chatter about which mirror is more beautiful, which mirror is more clearly seen, etc. Cao Ying even pulled Zhao Yan over to ask for his opinion. As a result, Zhao Yan could only nodded repeatedly, and no matter who asked, he said it was good.

Zhao Yan brought back a lot of mirrors. Cao Ying, Xue Ning'er, Yelu Si, and Ouyang Wanling were all separated, and there were some left. Zhao Yan was not stingy, so he directly asked Xiao Douya and Mixue to come forward to pick one. As a result, these little girls were so happy that they put the mirrors they had picked carefully in their arms, for fear that they would fall out accidentally, and they became timid when working, and the speed of serving dishes was much slower. Cao Ying was so angry that he asked these girls to go back to the room, put the mirrors before coming back.

"Husband, the mirror has been made. How to produce the Taoist sect? You have to know that our family still has 30% of the shares?" During the meal, Cao Ying asked Zhao Yan. Compared to the mirror, she cared more about the income brought to the family.

"I haven't asked about this yet, but Taoist sects have always done things very quickly. I guess they will send someone to talk to each other in the next two days. When Ying'er, you call me and we will talk to them together. We must not suffer any losses in this matter!" Zhao Yan said domineeringly. Although the division of the money was agreed, there are many ways to deal with a cooperative business, and you may lose a lot of benefits if you are not careful. So you must not be careless next.

"Haha, I feel relieved if I have my husband here. The Taoist sect has asked for my husband several times, and they must not dare to play any tricks at that time." Cao Ying smiled when she heard this. She was really worried that she would not be shocked. However, with Zhao Yan here, even if she didn't speak, she would have the confidence.

Two days later, it was exactly ten days. It was equivalent to Sundays in later generations. Zhao Yan had long wanted to implement the Sunday system, but there were no Sundays in the Song Dynasty, only ten days per day. So he followed the local customs and stipulated that schools and lectures would be closed for ten days, which was the same as the daily routine of the Imperial College and major academies.

Taking advantage of the tenth day of the day, Zhao Yan rushed to the palace in Tokyo again. Last time, Cao Qi asked him for help, he had to figure out why the court had to ask for lead glass? He could have gone to the military weapon supervisor to inquire. But later Zhao Yan thought about it and decided to go directly to the palace, ask the reason clearly, and see if there is a solution?

"Yan'er, why are you here? Don't you need to give lectures today? Cough cough~" Zhao Shu asked Zhao Yan in after receiving the report, and then asked without raising his head. But then he coughed a few times. It seemed that his body still had not fully recovered. In addition, there were many memorials on the dragon table in front of Zhao Shu, and I don't know when it will be reviewed.

"Why did Dad forget it? Today is the tenth day. Even the ministers need to rest." Zhao Yan walked forward with a smile.

Hearing Zhao Yan's words, Zhao Shu raised his head and showed a thoughtful look. It seemed that he had really forgotten that today was ten days. At this time, Zhao Yan realized that Zhao Shu's face was pale, but his cheeks were a little abnormal flushed, and his lips were a little dry. He knew at a glance that he was not cured. This made Zhao Yan unable to help but worry again: "Dad, your condition has relapsed again, why don't you pay attention to rest?"

Hearing Zhao Yan's words, Zhao Shu waved his hand and said, "My body is a little uncomfortable, but it's not a big problem. I have been having chest tightness and cough since I was a child. I may have been a little tired these days, so this old problem has been dealt with again, cough cough~"

When Zhao Shu said the last time, he coughed twice again. Although it didn't sound very serious, Zhao Yan could clearly hear that his cough contained phlegm, which made Zhao Yan unable to help asking again: "Dad, it's not a solution for you to cough like this. Have you ever let the imperial doctor see it?"

"Don't worry, the imperial doctor has seen it, but it's because the lung disease has not been cured. He has prescribed several doses of lung clearing and cough-relieving medicine. I believe it will be fine if you drink it for a few days." Zhao Shu put down the pen in his hand and smiled. His old problem has been entangled with him for nearly half a lifetime. Although it is very uncomfortable, it is not fatal. He has gradually gotten used to it.

"By the way, Yan'er, why did you come to the palace today? I remember you are a busy person now. Even if it's ten days, I'm afraid there are many things to do, right?" Zhao Shu asked with a smile again at this time, and he was becoming more and more satisfied with Zhao Yan's son.

Although Zhao Yan was a little worried about Zhao Shu's body, when he heard him ask about the reason for his arrival, he hurriedly said: "Dad, the microscope I developed with Daomen a few days ago has finally succeeded. I was about to make a few more, but I didn't expect that Daddy had issued an order some time ago to requisition the lead glass produced by Daomen, which made the microscope impossible to make. So Erchen came here today to ask Daddy what you need lead glass for and whether there is any place you need Erchen's help?"

"Haha, it turns out that you are asking about this. In fact, the reason why I ordered to requisition the lead glass of the Taoist sect was mainly because of you!" Zhao Shu suddenly laughed after hearing Zhao Yan's words.

"I? What does it have to do with me?" Zhao Yan said in surprise. He didn't expect that this matter would go around and finally end up on his head again.

"Haha~, it seems that Yan'er, you are really forgetful. A few months ago, you held a moon viewing meeting in the microscope. That day, I went there. After passing the telescope, I did see the true face of the moon. Originally, this matter was over, but Shen Kuo, who was a military weapon supervisor, also went there that day. After using the telescope, he immediately realized that this thing could be used in military aspects. So he borrowed the telescope from the microscope for a few days under the banner of the court..."

Zhao Shu talked about the reason for the matter, which not only involved Zhao Yan, but also Shen Kuo. In short, Shen Kuo discovered the military purpose of the telescope, and then borrowed some experiments for a few days, and figured out the structure and materials used by the telescope. He only made suggestions to the court a few days ago, hoping to make a large-scale telescope and equip the generals in the army, so that the generals can discover the enemy's dynamics first when marching and fighting.

After receiving Shen Kuo's suggestion and seriously considering it, Zhao Shu finally decided to agree with his suggestion. Only among the telescope materials submitted by Shen Kuo, lead glass can only be produced by Taoist silhouettes, so in this case, Zhao Shu could only issue an order to requisition the lead glass of Taoist silhouettes.

"Who said that lead glass must be used for telescopes?" Zhao Yan asked in surprise when he heard this. The telescope is not a microscope. Although it is definitely better to use lead glass, it can also be replaced by some ordinary glass with better light transmittance.

"Huh? The materials used to make telescopes are obtained from the moon-looking telescope in the Taoist sect. Shen Kuo also specifically stated that special glass should be used. I asked someone to inquire and found out that it was lead glass. Is there anything wrong with this?" Zhao Shu asked in surprise when he heard Zhao Yan's words.

When Zhao Yan heard this, he slapped his head. He finally understood why Zhao Shu issued an order to ask for lead glass. It turned out that although Shen Kuo and the others had studied the structure and materials used in the telescope, they did not dare to change it without authorization. The telescope that was observing the moon was specially urged by Zhao Yan to make it out of lead glass. As a result, Shen Kuo copied all the materials according to the script.

Thinking of this, Zhao Yan had no choice but to explain to Zhao Shu helplessly, and finally concluded: "Dad, the manufacturing of lead glass is very complicated and the output is not much. If you only use lead glass to make a telescope, you may not be able to make much. However, unlike a microscope, the telescope is not particularly strict for the transparency of glass, so you only need to use ordinary glass with better light transmission."

"So that's it. I was worried about the insufficient production of the telescope before, but now it seems that Shen Kuo and the others have made a mistake." Zhao Shu also spoke with a sudden look when he heard this.

"Haha, Shen Kuo and the others are not a mistake. In the future, they can use lead glass to make a batch of high-end telescopes to reward the meritorious efforts of the army. As for those ordinary telescopes, they can try to equip the generals as much as possible." Zhao Yan also smiled at this time. Shen Kuo was a little anxious about doing this, and he did not ask for his own opinions. It seemed that he wanted to show himself in a hurry, but he did not expect to make a mistake. It seems that the evaluation of Shen Kuo in history is correct. His pursuit of fame and fortune is indeed stronger than that of ordinary people.

"Haha~, Yan'er, your head is turning quickly, this is a good idea!" Zhao Shu praised when he heard Zhao Yan's suggestion, "In addition, since Yan'er, you are here, then you can inform the military weapon supervisor and tell them that the telescope does not require lead glass, so as not to be dissatisfied with the people in the Taoist sect."

"Dad is wise, I'll inform the military weapon supervisor now!" Zhao Yan immediately took the order. In fact, he also knew that the reason why Zhao Shu sent him there was to hit Shen Kuo and not be too eager for quick success and instant benefits.

"Cough cough cough~" Just as Zhao Yan was about to turn around and leave, Zhao Shu suddenly made another violent cough, which made Zhao Yan unable to help but stop. Then hesitate for a while, and finally said, "Dad, I have a way to cure your lung disease. I wonder if you are willing to give it a try?" (To be continued, please search for Astronomy, the novel is better and faster!
Chapter completed!